But the UI isn't physical, hence my point - there is no feedback from dragging a Window, your hand doesn't get heavier because you're now holding a Window with mass/inertia/friction.
You have those when moving a mouse while holding a button, but that's not related to UI, you could just as well use it to do nothing, feedback is the same - NOT from the UI
Otherwise your fingers have the same things, so any gesture involving those is feedback just like the one you get if you touch non-finger object like a mouse
There is no difference. You can't feel the part of the computer system that registers those clicks, the same as with the camera. Maybe your mouse driver registered a double click due to a faulty sensor, maybe it registered nothing for the same reason, maybe you bluetooth mouse is disconnected or out of juice, so nothing resisters.
All of this is exactly the same - you have no tactile UI feedback
The likelihood of a mouse button tactile feedback not matching what the computer actually sensed is much lower than the likelihood of a camera not picking up your pinch-touch gesture.
You have those when moving a mouse while holding a button, but that's not related to UI, you could just as well use it to do nothing, feedback is the same - NOT from the UI
Otherwise your fingers have the same things, so any gesture involving those is feedback just like the one you get if you touch non-finger object like a mouse